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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.1 (2010/10/01)
#include "Wm5MathematicsPCH.h"
#include "Wm5IntrRay2Box2.h"
#include "Wm5IntrLine2Box2.h"
namespace Wm5
{
//----------------------------------------------------------------------------
template <typename Real>
IntrRay2Box2<Real>::IntrRay2Box2 (const Ray2<Real>& ray, const Box2<Real>& box)
:
mRay(&ray),
mBox(&box)
{
}
//----------------------------------------------------------------------------
template <typename Real>
const Ray2<Real>& IntrRay2Box2<Real>::GetRay () const
{
return *mRay;
}
//----------------------------------------------------------------------------
template <typename Real>
const Box2<Real>& IntrRay2Box2<Real>::GetBox () const
{
return *mBox;
}
//----------------------------------------------------------------------------
template <typename Real>
bool IntrRay2Box2<Real>::Test ()
{
Real WdU[2], AWdU[2], DdU[2], ADdU[2];
Vector2<Real> diff = mRay->Origin - mBox->Center;
WdU[0] = mRay->Direction.Dot(mBox->Axis[0]);
AWdU[0] = Math<Real>::FAbs(WdU[0]);
DdU[0] = diff.Dot(mBox->Axis[0]);
ADdU[0] = Math<Real>::FAbs(DdU[0]);
if (ADdU[0] > mBox->Extent[0] && DdU[0]*WdU[0] >= (Real)0)
{
return false;
}
WdU[1] = mRay->Direction.Dot(mBox->Axis[1]);
AWdU[1] = Math<Real>::FAbs(WdU[1]);
DdU[1] = diff.Dot(mBox->Axis[1]);
ADdU[1] = Math<Real>::FAbs(DdU[1]);
if (ADdU[1] > mBox->Extent[1] && DdU[1]*WdU[1] >= (Real)0)
{
return false;
}
Vector2<Real> perp = mRay->Direction.Perp();
Real LHS = Math<Real>::FAbs(perp.Dot(diff));
Real part0 = Math<Real>::FAbs(perp.Dot(mBox->Axis[0]));
Real part1 = Math<Real>::FAbs(perp.Dot(mBox->Axis[1]));
Real RHS = mBox->Extent[0]*part0 + mBox->Extent[1]*part1;
return LHS <= RHS;
}
//----------------------------------------------------------------------------
template <typename Real>
bool IntrRay2Box2<Real>::Find ()
{
Real t0 = (Real)0, t1 = Math<Real>::MAX_REAL;
return IntrLine2Box2<Real>::DoClipping(t0, t1, mRay->Origin,
mRay->Direction, *mBox, true, mQuantity, mPoint, mIntersectionType);
}
//----------------------------------------------------------------------------
template <typename Real>
int IntrRay2Box2<Real>::GetQuantity () const
{
return mQuantity;
}
//----------------------------------------------------------------------------
template <typename Real>
const Vector2<Real>& IntrRay2Box2<Real>::GetPoint (int i) const
{
return mPoint[i];
}
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
// Explicit instantiation.
//----------------------------------------------------------------------------
template WM5_MATHEMATICS_ITEM
class IntrRay2Box2<float>;
template WM5_MATHEMATICS_ITEM
class IntrRay2Box2<double>;
//----------------------------------------------------------------------------
}
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